When I carried my Weber Q100 (?) grill, I always let it burn off before and after using it. Then I stored it inside a large tupperware plastic tub (with lid). I did this primarily so I could stack other things on top of it. I also drilled ventilation holes in the lid. Kept it in the basement and never had any bug/rodent problems. I never 'clean' a grill (no soap - ever). Letting it burn off at high temp for 10-15 minutes before AND after grilling is all I've ever done with ANY grill for the last 50 years. If there is a buildup, I will take it apart, get a scraper, and go at it. But no water and absolutely no soap. Unless you like the taste of soap.
I now carry a charcoal grill and just close all the vents and put it inside a big trash bag before setting it in the basement.
